(YouTube Link)
This start-up proposes to use robots to carve the lunar surface dust into patterns that could serve as advertisements. I'm skeptical due to the sheer scale of the task -- the number of robots necessary over a very long period of time. Still, people said that we'd never have bacon flavored vodka, but scientists and engineers overcame the obstacles. Anyway, we know from an episode of The Tick that it can be done.
Link via Popular Science